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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

Imagery provided by Aladin sky atlas

HR Diagram
Miram
Nashira
La Superba
Mekbuda
Koeia
KR Muscae
Kruger 60 A
DO Cephei
Polis
θ Hydrae
TZ Arietis
Struve 2398 B
Xi Boötis B
x Carinae
w Carinae
ο1 Cygni
Petra
π Cephei
s Velorum A
Pincoya
Kapteyn's Star
Chaophraya
Cerberus
AU Microscopii
AX Microscopii
b Velorum
41 Draconis
75 Cygni
a Velorum
Nosaxa
HD 37131
GX Andromedae
Guniibuu
Groombridge 1618
Gakyid
Gliese 887
Gliese 687
Gliese 440
Inquill
IL Aquarii
k Hydrae
Dombay
e Aquilae
Ebla
CS Camelopardalis
ε Indi
Erakis
Felixvarela
Thabit
ν2 Canis Majoris
γ Pavonis
ρ Cygni
Alfirk
Teegarden's Star
β Pictoris
Proxima Centauri
Polaris
d Lupi
ζ Arae
π5 Orionis
15 Orionis
ν Persei
ι1 Scorpii
Ran
τ Ceti
Adhafera
Alchiba
θ Circini
Almaaz
Alnilam
BF Orionis
Capella
Betelgeuse
Naos
δ Caeli
FL Virginis
σ Orionis
Acubens
Sirius B
Schedar
Mu Aquilae
52 Orionis
U Sagittarii
ε Reticuli
EE Leonis
Sharjah
61 Cygni A
Arneb
Mebsuta
HO Librae
Unurgunite
Hind's Crimson Star
Enif
ο Capricorni B
Antares
UV Ceti
Hatysa
Mira
Atria
van Maanen's Star
Rigel
Avior
α Centauri A
δ Muscae
Ross 154
Achird
Mirfak
Deneb
Berehynia
WX Ursae Majoris
Wolf 498
Wolf 359
Wezen
Suhail
Sadr
Diya
η Carinae
Tureis
Azmidi
Sargas
χ Cygni
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

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